length.3Cg

Langue: en

Version: 343785 (ubuntu - 24/10/10)

Section: 3 (Bibliothèques de fonctions)

Sommaire

NAME

length - return scalar Euclidean length of a vector

SYNOPSIS

   float length(float v);
   float length(float1 v);
   float length(float2 v);
   float length(float3 v);
   float length(float4 v);
 
 
 

   half length(half v);
   half length(half1 v);
   half length(half2 v);
   half length(half3 v);
   half length(half4 v);
 
 
 

   fixed length(fixed v);
   fixed length(fixed1 v);
   fixed length(fixed2 v);
   fixed length(fixed3 v);
   fixed length(fixed4 v);

PARAMETERS


v
Vector of which to determine the length.

DESCRIPTION

Returns the Euclidean length of a vector.

REFERENCE IMPLEMENTATION

length for a float3 vector could be implemented like this. 
   float length(float3 v)
   {
     return sqrt(dot(v,v));
   }

PROFILE SUPPORT

length is supported in all profiles.

Support in the fp20 is limited.

SEE ALSO

max, normalize, sqrt, dot